Air-heating attachment for fans



Oct. 30 1923. Y

F. M. HOWE ET'AL AIR HEATING ATTACHMENT FOR FANS Filed Dec. 21. l92l\ 2Sheets-Sheet 1 a f 9 J 1 1 i Fi Sum/"06 FRHNK MUREFIN Haws vg?how/Rmflaw/15m./

Oct. 30 1923. 1,472,124

F. M. HOWE ET AL AIR HEATING ATTACHMENT FOR. FANS Filed Dec. 21. 1921 2Sheets-Sheet 2 9 FRfiN/(MUREHN How:

18 20 3 QHQM w Q a, F 1g. 1 is an elevation partly in section PatentedOct. 30, 1923.

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Application filed December 21, 1921. Serial Io. 528,905.

To all whom it may concern:

Be it known that we, FRANK MORGAN- Hown and Cmnnns Nassau, both citizensof the United States, residing in the city,

. a county, and State of New York, and in Long Island City, county ofQueens, .State of New York, respectively, have invented certain new anduseful Improvements in Air-Heating Attachments for Fans, of whichthefol- 1o lowing is a full, true, andv accurate description. l I

Our invention relates to an electric attachment for heating air and hasas certain of its objects the provision. of an attach- 1s ment which isconvenient in use and which will provide a comparatively concentratedcurrent of warm air. The novel features of our invention are pointed outwith particularity in the appended! claims. The invention itself,however, ,with further objects and advantages, will best be understoodfrom theifollowingdescription taken in connection with the accompanyingdrawing in which illustrating a heatin attachment according toour'invention app led to aim of ordinary type. l Fig.12-js a .front viewof the apparatus shown'in-Fig. 1. I Fig. 3 is an elevation of theattachment illustrated in Figs. 1 and 2 as it appears when Y deta'chedfrom the fan.

Fig- 4 is a detail of the electrical connections for the heatin elementof the attachment illustrated in i'gs. 1, 2 and 3.

Fi 5 is a detail of the means for supporting t e heatin element of theattachment illustrated in igs. 1, 2 and 3.

, Figs. 6 and? are details of modified forms of center shields which maybe substituted, according to oiir invention, for the shield illustratedin Figs. 1,2 and 3.

In the drawing 1 is an electric fan which may be of any known or desiredtype for use in oflices or household] uarters. Fans of this t e are, asis well own, ordinarily provi ed'with a wire, cage or shield 2 toprotett persons and ob'ects rom comin' in con- .with, the fan b ades 3,3 when t e fan is use. Shields 2 ordinarlly comprise a rear ring 2! in aplane at right angles to the axis of revolution of the fanblades and thefront ring 2" spaced from the ring 2' and held in a 2 plane parallel tothat of ring 2 by means of braces or connecting wires 4.

An attachment according'to our invent on comprises a cylinder .5, therear portron 5 of which is adapted to fit closely over the outside ofthe ring 2", cylinder 5 having internal shoulder 5 which limits themovement of cylinder 5 on the ring 2". Sei cured to cylinder 5, atpoints 6, 6 are a plurality of coil springs 7, 7 ,-'-the free ends ofwhich are formed into hooks 8, 8 adapted to be passed over the rear ring2 of the .shield or guard 2, as illustrated in Fig. 1,

and when the parts are-in this position, the

heating attachment is securely but removably held on the shield or guard2. 'Supported by the cylinder 5 and extending forwardly therefrom is ahemispherical frame work 9 of wire or similar material. Supportedonframe work 9 is a ring 10 of sheet metal or the like designed to supporta heating coil 11 and we prefer to make the ring 10 of frusto conicalform in order to con- 2 centrate the air from the fan into a stream ofconvenient cross-section. {The heating co1l or element 11 isconveniently disposed within the, support 10 in an annular arrangement,being held at'intervals by heat resistant insulating members .12, 12which are secured to the band 10 by means of screws 13 or otherconvenient means, the

supports-.12 preferably having apertures -i Heating element 11v may bethreaded. As

clearly appears in. Figs. 1' and 2 the wire of element 11 is coiledhelically' in order to proyide-a large length of wire and obtainresistance for 'use'on an ordinary lighting circuit. We find that we mayuse for element 11 ordinary resistance wire of about No. 20 B. & S.gauge, and that this sized wire, when coiled as illustrated in Fig 2,

I 14,there in through whichthe wire of the fan, has substantially theform of a hollow cylinder, very little air coming oif from points nearthe ends and near the centers of the blades. Our experiments have shownfurther that, largelyfor this reason, a heating element having agenerally cylindrical or annular arrangement is the only one givingreasonable efiiciencywith a commercially practical type of heater whenused with the ordinary type of electric fan. However, when the heatingelement is placed in the flow of air from such ordinary type fan, thedistribution of the airflow is disturbed to some extent by the heatingelement itself and it is therefore desirable to check the flow.

The ends of the heating element or coil 11 are brought out through thesupporting member 10 by means of rods 17 extending through insulatingblocks 18, 18, connection of the heating element 11 to the lead wires19, 19 being made at points 20, 20.

Having thus described ourinvention, We claim: 1. A heating attachmentfor fans, comprising a heating element, a cylindrical member forsupporting the attachment to rent of air flowing perpendicular to theplane of the ring, means for restricting the flow through the center ofthe heating element, and means for restricting the flow of air outsideof said heating element.

3. An air heating attachment for fans comprising a heating element, acylindrical member for supporting the attachment and to which saidheating element is connected, said cylindrical member having an internalshoulder for limiting its movements with respect to an external support,and springs secured to said cylindrical member, said springs havinghooks formed thereon for securing said cylindrical member-to a suport. rI. p FRANK MORGAN Howe."

CHARLES NAEG'ELI.

